Cabling &Network Glossary.

Electronic entry systems, card readers, keypads, biometrics, wired with composite cable carrying power, data, and door-contact pairs.

A networked radio that broadcasts a Wi-Fi SSID. Modern enterprise APs are PoE-powered and managed by a controller or cloud platform.

Signal coupling between adjacent cables in the same bundle (rather than between pairs in the same cable). Becomes a limiting factor at Cat6A and above; mitigated by separation and shielded constructions.

Angled Physical Contact (APC, green boot) polishes at 8° to minimise back-reflection in single-mode systems. Ultra Physical Contact (UPC, blue) polishes flat. Never mate APC to UPC.

Final drawings, port maps, test reports, and labels delivered at closeout, reflecting the system as installed, not just as designed.

Inter-floor and inter-building cabling that links telecom rooms, equipment rooms, and entrance facilities. Usually fibre on modern builds.

The minimum curve a cable can take without degrading performance. Typically 4x cable diameter for unshielded twisted pair under no-load conditions.

A filler panel installed in unused rack U-spaces to prevent hot exhaust air from recirculating to server intakes. Cheap, high-impact for cooling.

A Wi-Fi 6 feature that tags transmissions with a colour code so co-channel neighbours can ignore one another, reducing contention.

Rack Unit, the vertical measure of rack-mount equipment. 1U = 1.75” (44.45 mm). A standard cabinet holds 42U or 48U.

Enhanced Category 5 twisted-pair cable rated for 1 Gigabit Ethernet up to 100 metres. The legacy minimum for data cabling; effectively superseded by Cat6/Cat6A.

Twisted-pair copper rated for 1 GbE at 100m and 10 GbE up to 55m. Tighter twist rates and a spline separator give improved crosstalk over Cat5e.

Augmented Category 6 rated for full 10 GbE up to 100 metres with much-improved alien crosstalk. Today’s default for new enterprise horizontal runs.

Individually shielded twisted-pair (S/FTP) rated for 10 40 GbE in short reaches. Common in industrial floors and high-EMI environments.

Shielded twisted-pair rated for 25/40 GbE up to 30 metres, a short-reach data centre uplink medium, not a horizontal cable.

Channel tests include the work-area cord and equipment cord. Permanent link tests just the fixed horizontal cable plus terminations. Different headroom budgets.

A cabinet layout where server intakes face one aisle (cold) and exhausts face another (hot). Containment doors and curtains keep airflows separate.

Physical partitioning of hot or cold aisles using doors, curtains, or ceilings to stop mixing of supply and return air. Improves PUE materially.

A patching arrangement joining two passive endpoints (e.g. carrier handoff to tenant cage) without any active device in between. Common in colocation.

Canadian Standards Association and Underwriters Laboratories of Canada listings, third-party certifications required for low-voltage and fire-alarm products in Canada.

Direct Attach Copper (twinax) and Active Optical Cable, fixed-length transceiver-and-cable assemblies for short top-of-rack uplinks at 10 400 GbE.

Cable rated for life-safety circuits, usually with a red jacket. Subject to CSA/ULC listings and CEC Section 32 wiring methods.

Sealing of cable penetrations through fire-rated walls and floors with intumescent putty, pillows, or pre-engineered devices to maintain the assembly’s rating.

The industry-standard handheld cable certifier that measures wire-map, NEXT, return loss, length, and propagation delay against TIA Category specifications.

Permanently joining two fibres by aligning the cores and fusing them with an electric arc. Targets sub-0.05 dB average loss per splice.

A floor-plan overlay showing predicted or measured Wi-Fi signal strength, SNR, or AP coverage zones. The deliverable from a site survey.

The portion of structured cabling between the telecom room and the work-area outlet, a single permanent run, no longer than 90 metres in solid copper.

The signal power lost across a fibre link from one end to the other. Measured in decibels with a light source and power meter.

Audio or audio-video stations at building entries integrated with phone systems or access control, typically Cat6 cable with PoE.

Network-based video surveillance using IP cameras (PoE-powered) recorded to NVRs. The modern replacement for legacy analog/coax CCTV.

A modular snap-in connector that terminates the horizontal cable at the work-area faceplate. Standard-sized so any vendor jack fits any vendor plate.

Link Aggregation Control Protocol, 802.3ad mechanism for bundling multiple Ethernet links into a single logical channel for bandwidth and redundancy.

Single-fibre connector families. LC (small-form-factor latch) dominates the modern data centre; SC is push-pull bayonet; ST is twist-lock and legacy.

Fluke’s desktop tool for managing cable certifier results, exports the PDF / CSV reports clients receive in the closeout package.

Link Layer Discovery Protocol, a vendor-neutral way for switches and PoE devices to advertise identity, capabilities, and PoE class to neighbours.

Wiring rated below 50V, covers structured cabling, security, access control, intercom, fire alarm, and AV. Subject to ESA / CEC rules.

Main and Intermediate Distribution Frames, the equipment rooms where backbone cabling terminates and horizontal cabling originates.

A multi-fibre push-on connector carrying 12 or 24 fibres in a single ferrule. The default for 40G/100G/400G data-centre trunks.

Fibre with a 50 µm core that carries multiple light modes. In-building / data-centre medium. Grades OM1 through OM5; OM4/OM5 are today’s defaults.

Near-End Crosstalk, unwanted coupling between adjacent pairs at the same end. PSNEXT sums the contribution from all three disturbing pairs.

Orthogonal Frequency-Division Multiple Access, Wi-Fi 6 mechanism that lets multiple clients share a single channel concurrently. Big gain for high-density.

A low-water-peak single-mode fibre suitable for indoor and outdoor runs. The default single-mode for new installs across LAN and outside plant.

Optical Time-Domain Reflectometer, injects a light pulse and reads back-reflection to map splice locations, link length, and per-event loss.

A rack-mounted termination point where horizontal cabling lands. Each port is then patched to an active switch port with a flexible patch cord.

Power Distribution Unit, the rack strip that distributes mains power to equipment. Metered, monitored, or switched variants per outlet.

Passive Infrared motion detector, reads ambient heat changes to trigger intrusion alarms, door-side egress requests, and lighting control.

Cable jacket rated for installation in return-air plenums. Low smoke output, flame-resistant; required by code in commercial air-handling spaces.

A family of standards that delivers DC power over the same twisted-pair as data. PoE+ (30W), PoE++ Type 3 (60W), Type 4 (90W) drive APs, IP cameras, door controllers, and IoT.

The time a signal takes to travel from one end of a link to the other. Pairs in the same cable should be within a small skew of each other.

Power Usage Effectiveness, total facility power divided by IT load power. 1.0 is theoretical perfect; modern hyperscale runs ~1.1 1.3.

Ratio of incident to reflected signal power on a cable. Higher return loss = better impedance match and less signal degradation.

Cable jacket rated for vertical runs between floors. Not approved for plenum but lower cost than CMP for non-plenum applications.

Hot-pluggable transceivers for fibre uplinks. SFP (1G), SFP+ (10G), SFP28 (25G), QSFP+ (40G), QSFP28 (100G), QSFP-DD / OSFP (400G).

Fibre with a 8 9 µm core that carries a single light mode, the choice for long distance and high bandwidth (campus, ISP, metro).

RF coverage study using predictive modelling (Ekahau, iBwave) and on-site validation to determine AP count, placement, channel plan, and power.

A protocol that prevents loops in switched networks by selectively blocking redundant paths. Modern variants: RSTP, MSTP, PVST+.

A protected enclosure inside a fibre panel that organises and secures splice points. Cassettes accept pre-terminated MPO trunks and break them out to LC duplex.

Service Set Identifier, the broadcast name of a Wi-Fi network. Enterprises usually run separate SSIDs for corp, guest, IoT, and BYOD.

Tier 1 (basic) verifies insertion loss, length, and polarity with a light source and power meter. Tier 2 (extended) adds an OTDR trace to characterise every event.

A cabling architecture where each cabinet has its own switch at the top. Servers connect via short Cat6A, Cat8, or DAC cables.

A switch port that carries multiple VLANs tagged with 802.1Q headers, typical between switches or to virtualised hosts.

The higher-bandwidth port on a switch that aggregates access ports up to a distribution layer, typically a 10/25/100 GbE fibre SFP.

Virtual LAN, logical segmentation of a switched network into broadcast domains. Separates guest, corp, voice, IoT, and management traffic.

Successive 802.11 generations. Wi-Fi 6 (ax) adds OFDMA and BSS colouring; 6E adds 6 GHz spectrum; Wi-Fi 7 (be) brings 320 MHz channels and MLO.

A continuity test that confirms each conductor lands on the correct pin at both ends, catches split pairs, miswires, and shorts before service.

An optional distribution point between the equipment row and the cabinet, typically a passive cross-connect cabinet that aggregates rows.